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1:45 AM
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Q: Looking for example ML flow for feature selection for increasing company's revenue

AlexanderI have a data set where company's gross revenue depends on number of features. I would like to identify features that influence net revenue for the company. So I want to build a ML pipeline to output which feature plays is the most significant. So, I'm looking for example data sets that I can ...

 
 
2 hours later…
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3:30 AM
 
 
3 hours later…
6:21 AM
@A_ I think "You can perform this action again in 1 second" means you can attempt to vote again, not that the votes allowance has reset
@MilkyWay90 Non-British English may be a better way of saying it
 
0
A: Sandbox for Proposed Challenges

jimmy23013Approaching the Graham's number cops-and-robbers Write a program that could theoretically output an integer with the minimum absolute difference to the Graham's number. Your code is cracked if a robber writes a program to output the Graham's number exactly, in the same language, with the edit di...

 
6:43 AM
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Q: DCC model estimation with t-Student distribution rmgarch

Tommaso FerrariI was analyzing and implementing the DCC model (Dynamic Conditional Correlation) for the one-day forecast calculation of the variance-covariance matrix of a system consisting of, approximately, 30 stocks. For each title I consider a historical series of logarithmic daily returns of 250 samples. ...

 
7:22 AM
@J.Sallé why would anyone think this is a good idea?
 
A _
I added 1 grain of sugar and the bacon tasted great.
@J.Sallé It is a good idea to fry some bacon and add 1/8 grains of sugar. (Split a grain of sugar into 8 equal parts and take 1 part.)
 
A _
8:17 AM
Now what will happen when the New Sandboxed Posts bot responds?
 
0
A: Sandbox for Proposed Challenges

A _Golfed User-Pinging In this task, you will take a CGCC user ping as input and output the "golfed" user ping as an output. Typically, the characters after the space after their username can be trunctuated. The input will not contain spaces in it, so you have to search for the user before doing th...

 
8:42 AM
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A: Sandbox for Proposed Challenges

user2190035Unlock you Lock You have locked your bike with a combination lock of 3 digits. Now you want to go for a ride and need to unlock it with the help of following program. Input 1st parameter The digit combination of your lock in "locked" state. It must be different from the combination of "unlock...

 
 
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10:01 AM
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A: Sandbox for Proposed Challenges

JitseGenereate a random unit vector code-golfrandommathgeometryarithmeticnumber-theory The Challenge Write a function that takes no input and generates a vector of length 1 in a random direction. That is: an evenly distributed random point on the sphere $$x^2+y^2+z^2=1$$ Like such: Output Three...

 
10:58 AM
-1
Q: Anybody have an up to date discount code?

JohnsonHow does groupon manage to get so many discount codes, also can one start a business online similar to it?

 
11:57 AM
0
Q: The fastest Sudoku solver

maxbThe goal of a game of Sudoku is to fill the board with the numbers 1-9, one in each cell, in such a way that each row, column and box only contains each number once. A very important aspect of a Sudoku puzzle is that there should only be one valid solution. The goal of this challenge is simple,...

 
 
1 hour later…
1:16 PM
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Q: Nothing like a good ol' game of ModTen

ArnauldDisclaimer: ModTen is a fictional card game which was created for the sole purpose of this challenge. The rules of ModTen ModTen is played with a standard 52-card deck. Because the full rules are yet to be invented, we're going to focus on the hand ranking exclusively. A winning hand in ModT...

 
1:55 PM
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Q: The Knight's estate

Ver NickAnd then the King said: You fought bravely, Knight, and your deed will not be forgotten for centuries. For your valor I grant you this castle and the lands around it. However, the strictest of the prohibitions was violated by you - all the warriors saw you fighting without a hat on your head like...

 
A _
2:44 PM
Who_Can_Compress_This_In_Stax?
This is not neccecarily a Chat Mini Challenge, it is actually quite trivial.
 
2:59 PM
I got addicted by Binary Lambda Calculus
it's such an awesome language
the programs carry so freaking much entropy with them
 
3:18 PM
cool
 
@A_ Not Stax, 18 bytes
 
 
3 hours later…
6:12 PM
0
A: Sandbox for Proposed Challenges

Naruyoko"Condense" String of Text You will be given a string. You will be "condensing" it by combining the bits of characters into one. Rules The condensation works as follows: You are given a string with 8-bit characters, such as Hèl¹ò Wôrld, hex 48 e8 6c b9 f2 20 57 f4 72 6c 64 Combines bits into...

 
6:39 PM
Does anyone know how to make a constant pointer-to-pointer-to-pointer style multidimensional array in C?
I've written what I think is a functional submission to a challenge, but I can't test it.
(I know this is possible, because I've done it before… I just don't know how.)
 
So like const int **test[5];?
Or const int ***test;?
 
The latter.
 
Well they're almost the same
First just has a max size, but other than that they're both a constant pointer-to-pointer-to-pointer
 
No, I meant the data.
 
const int arr[2][2][2] = {{{0, 1}, {2, 3}}, {{4, 5}, {6, 7}}};
 
6:47 PM
@DJMcMayhem **arr will segfault.
 
That's just an arr[8] with syntactic sugar.
 
If you want it dynamic, I don't think it can also be const.
 
I found an interesting bug in my code
 
@wizzwizz4 Is contiguous memory a problem?
 
6:50 PM
@DJMcMayhem No…
But it's just syntactic sugar:
 
Just don't mix the syntactic sugar with bacon.
 
The memory at arr doesn't actually contain a pointer to {{0, 1}, {2, 3}}.
The memory at arr+1 doesn't actually contain a pointer to {{4, 5}, {6, 7}}.
@MilkyWay90 Excellent Hello, World! implementation. 10/10
 
@wizzwizz4 Sure it does: tio.run/…
The definition of "+1" changes depending on how deep you dereference it
(I think)
@AdmBorkBork Rookie mistake
 
#define bacon(x) int main(int argc, char **argv){x; return 0;}
2
 
7:06 PM
@DJMcMayhem Syntactic sugar.
 
OK, well either you use the syntactic sugar or I have no idea how to help, because I don't know how you could make a const dynamic array.
 
ngn
hey, earlier today there were some funny comments about trump below this answer. now they've disappeared without a trace. what's going on here?
 
Comments can always get deleted with no notice.
 
ngn
@DJMcMayhem seems unlikely that all people who commented decided to do that at the same time
 
I meant that mods can always delete comments with no notice.
The answer was needlessly political (and also invalid), now that it's fixed none of the comments are relevant.
 
ngn
7:25 PM
@DJMcMayhem indeed it was needlessly political. the challenge was too. i suspect most of the 23 upvotes were precisely because of that. yet, isn't censorship an overreaction?
 
How is the challenge political? It makes no judgement of any political figures, it's just about history
 
ngn
imo, a few downvotes or warnings would have been a more proportionate response
@DJMcMayhem what could be more political than a list of US presidents, including the incumbent? :) the exact strings or dates weren't essential to the challenge. a list of pharaos would have done just as fine and not stirred up trouble
and given the OP did use US presidents, why should a mod use the nuclear option on comments? that seems way over the top to me
 
We delete dozens of irrelevant comments every day, most of them aren't missed.
 
@ngn I don't remember the specific comments, but some for sure didn't follow "Use comments to ask for more information or suggest improvements"
 
7:42 PM
@wizzwizz4 Yes, it is totally valid
 
@MilkyWay90 Starts with H, ends with !… I don't see any problem here.
 
@wizzwizz4 How about ♥♬♬獯猬 ♗♯♲♬♤, the middle
 
@MilkyWay90 Shh…
 
@wizzwizz4 Yeah, they won't notice that
but do you see the bug that is causing that?
 
The space is correct, too. So, you spot-checked about 23% of the characters and they're correct. Statistically, that's enough to draw some generalizations, right? ;-)
 
7:46 PM
hmm'
 
CMC: Given a string, determine if it's a "MilkyWay Hello World". A "MilkyWay Hello World" is any string where at least 20% of the characters in said string are equal to the corresponding character in the string "Hello, World!"
3
 
@DJMcMayhem That could be generalized into an actual challenge
 
Simplified slightly
"Hel" should be true
 
given two strings x and y, determine whether 20% of the characters from x are equal to the the corresponding character in y
 
Wait... At least 20% of characters in the input string? Does that mean that "H****" should be true since 20% of "H****" matches Hello world?
 
7:50 PM
@DJMcMayhem Hel[l] is what Malbolge is supposed to be like
 
No, Malbolge is literally the 8th circle of hell
 
this bug was from a malbolge interpreter
I meant the Malbolge programming language
 
That's where the name comes from
 
@MilkyWay90 That sounds like the subsequence challenge that the acronym challenge was just closed as a dupe of.
 
@AdmBorkBork true
@DJMcMayhem true
 
7:52 PM
@MilkyWay90 I don't understand what it does.
 
@wizzwizz4 It's supposed to run a Malbolge program which prints "Hello, World!"
It's literally a port of the C implementation
 
@AdmBorkBork No, they're different
The subsequence challenge is just x in y misread it
 
Oh, I see what you mean. Yeah, related but different.
 
@J.Sallé Does it handle multibyte chars?
It would be nice if it did
 
7:54 PM
@J.Sallé the cmc was updated to not require 13 chars exactly
 
So then the original would work
 
@dzaima bummer
@MilkyWay90 check the last test case in ^
 
Somebody should solve it in Malbolge
 
Go for it :P
 
7:58 PM
Brachylog, 15 bytes: l×₄/₅.&;Ḥz₀≠ˢl≤
 
I'm not that good at Malbolge for this
 
@J.Sallé 'He' fails; also, .2≤13÷⍨2<
 
except it might succeed where it shouldn't for some inputs longer than "Hello, World!"
 
@dzaima yeah I just noticed the mistake
 
i think this may be unsolved for years in malbolge
because of division
It's really hard to add, let alone multiply, and division is light-years away
 
8:00 PM
@MilkyWay90 it's not required
 
@dzaima How?
 
@J.Sallé Do the spaces in 13↑⍵ cause a problem?
 
@dzaima oh I see
 
@H.PWiz yes, as seen in my 'He' example
 
It may be feasible
I know just about as much as anybody who took a glimpse at the docs, so I don't know if it's feasible or not
 
8:02 PM
 
@dzaima You should put in @dzaima's fix
and I'm pretty sure @dzaima could help you golf it
 
With better behavior on long inputs, Brachylog, 16 bytes: l/₅.&;Ḥz₁{∋Ċ=}ᶜ≥
 
@dzaima -2 bytes
 
1
Q: Church Subtraction

Ryan SchaeferChurch Subtraction Lambda calculus has always been a fascination of mine and the emergent behaviors of passing functions into each other is delightfully complex. Church numerals are representations of natural numbers contructed from the repeated application of a function (normally the unary addi...

 
ngn
8:38 PM
@dzaima a few did suggest improving the answer by having it output the correct string "Donald Trump" instead of "orange idiot" :)
now, of course i don't think that phrase is appropriate and i would never have used it myself (trump is definitely not orange), but wiping out the whole stack of comments without leaving any record or explanation of what went on - well, that looks like abuse of mod power
 
@ngn that comment definitely matches "no longer needed" as the question now does do that. There are many times comments are deleted because of some named & known reason, why should them being political be a reason for mods to need to take special care explaining deletions?
 
ngn
8:56 PM
@dzaima in my experience, the commenter is usually the one who decides whether to keep the comment or delete it as no longer relevant
 
Like I said, comments get deleted all the time for being no longer needed. It's usually not a big deal
 
 
3 hours later…
11:51 PM
1
A: Sandbox for Proposed Challenges

A _Normalized Malbolge to Malbolge translator In this task, you will write a program/function that takes a Normalized Malbolge program and outputs the resulting Malbolge program. (This is a secret tool that all Malbolge programmers are using!) Input A data structure that (somehow) represents a No...

Reminding you all of the sandboxed posts that haven't been bumped in quite some time
and
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A: Sandbox for Proposed Challenges

Ed MartyBlack And White Shirts 3 This is the third in a series. The first can be found here, and the second here. The premise is similar to the first two, but with some changes and a new goal. Assume I have some number of black shirts and some number of white shirts, both at least 1. Both colors of shi...

 

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